jonnyboy wrote:Don't tap into an endcap use two pieces of chamber pipe to get to a suitable length then connect them with a tee fitting which reduces down to spark plug threads. Much easier and gives ideal spark placement.

Spark plugs don't use NPT.

Sorry I was under the impression that dyi's 20x cannon used an actual spark plug. Making your own spark gap encased in .5 inch pipe that screws into the tee is always an option.

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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile

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Yes, that is what I was originally thinking of doing, but a cheap spark plug and tap also seem like a good idea since it means I don't need any epoxy. I guess either method works since they both seem common.